Public bug reported:
Gnome Shell stops accepting mouse input from time to time, and when it
does I run "gnome-shell --replace" to get mouse control back. After
running this command, I can't log in because it's as if the ENTER key is
pressed every half second on the login screen. The lock screen tells me
that I typed in the wrong password and clears the password input. I
can't type my password in half a second.